/* Program that encrypts a given string via cube representations and rotations and later performs its decryption. */ // Note : For clear output, view the console // in landscape mode. // : Also, do not enter more than // 2 rotations if viewing output in // potrait mode, for better output. // Input - [OPTIONAL] A string to encrypt. // - [OPTIONAL] The encryption key. // (Cubes must be Space-separated) // Output - Encryption and Decryption of the // string, along with their Cubic // Representations. /* Sample Input : 1) I love coding and Sololearn. 0:U:U:L:D 1:U:R 2:U:L:L 2) The only thing that haunts, a ghost. 0:U 2:D:D 3) The string ends now. */ #include // generate(), replace() #include // cout, cin #include // setw() #include // rand(), srand() #include // stringstream #include // string, getline() #include // vector #include // array #include // time() using namespace std; // Redeclaration due to a template conflict. int Min(int a, int b) { return a>b?b:a; } // Positions for rotation in a set direction. // 0 = Down, 1 = Up, 2 = Right, 3 = Left const array rot = {"40375126", "15620473","32670154","45107623"}; // Class to store string as a cube and // perform rotational encryption. class Cube { array itm; // Data of the cube. vector key; // The rotation key. array out; // Stores changes. public: Cube(string_view str) { for(int i=0;i<8;i++) {itm[i]=(i<=str.size()?str[i]:'*');} } Cube(const Cube& c2) { itm = c2.itm; key = c2.key; } void Print() { for(int i=0;i<7;i++) cout< tmp; stringstream ss; for(int i=0;i k2; for(int i=0;i<7;i++) out[i] = ""; for(int i:key) { switch(i) { case 0: k2.push_back(1); break; case 1: k2.push_back(0); break; case 2: k2.push_back(3); break; case 3: k2.push_back(2); break; } } key = k2; reverse(key.begin(), key.end()); Encrypt(); key = {}; } void SetKey(string keyd) { key.resize(0); for(char c:keyd) { switch(c) { case 'U': key.push_back(1); break; case 'D': key.push_back(0); break; case 'L': key.push_back(3); break; case 'R': key.push_back(2); break; } } } void GenKey() { // Generates a randomly sized key. key.resize(1+(rand()%3)); generate(key.begin(), key.end(),[](){return rand()%4;}); } string ShowKey() { // Returns the formatted key string. string res; if(key.empty()) return "*"; for(int i:key) { switch(i) { case 0: res+="D "; break; case 1: res+="U "; break; case 2: res+="R "; break; case 3: res+="L "; break; } } res = res.substr(0,res.size()-1); replace(res.begin(),res.end(), ' ',':'); return res; } string Data() { // Returns the data of the cube. string res; for(int i=0;i<8;i++) res+=itm[i]; res.erase(remove (res.begin(),res.end(),'*') ,res.end()); return res; } }; int main() { /* Procedure : 0) Split the string into pieces of 8 and store each piece in a cube. 1) Encrypt each cube using a key. 2) Display the net encrypted string and the key. 3) Decrypt the cubes using the alter keys. */ srand(time(nullptr)); int i=0; string str,res,Key; getline(cin,str); if(str.empty()) { str="I was born with strings, but now I am free, free as a bird, on a big TV."; } vector cubes; getline(cin,Key); istringstream is(Key); string tmp; vector Frag; bool randomkey=1; while(str.size()>0) { cubes.emplace_back(str.substr(0,8)); str = str.substr(Min(8,str.size()) ,str.size()-Min(8,str.size())); } if(!Key.empty()) { while(is.good()){getline(is,tmp,' '); Frag.push_back(tmp);} randomkey=0; sort(Frag.begin(),Frag.end(),[] (string a, string b) {return a[0]

Challenge - Crypto-Cube (Cubic Encryption)